AMD provides their [http://support.amd.com/us/psearch/Pages/psearch.aspx?type=2.1&product=5.7&contentType=Tech+Doc+Processor&ostype=&keywords=&items=20 AMD64 Architecture and Software manuals], which are a very useful reference for AMD systems, of course (but also explain lots of non-AMD-specific x86 stuff too):

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AMD provides their [http://support.amd.com/us/psearch/Pages/psearch.aspx?type=2.1%3b2.12&product=5.7&contentType=Tech+Doc+Processor AMD64 Architecture and Software manuals], which are a very useful reference for AMD systems, of course (but also explain lots of non-AMD-specific x86 stuff too):